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Author's personal copy international journal of hydrogen energy 38 (2013) 1795e1805 Energy and exergy analyses of hydrogen production via solar-boosted ocean thermal energy conversion and PEM electrolysis Pouria Ahmadi*, Ibrahim Dincer, Marc A. Rosen Faculty of Engineering and Applied Science, University of Ontario Institute of Technology (UOIT), Oshawa, Ontario, Canada L1G8B8 Available online at www.sciencedirect.com journal homepage: www.elsevier.com/locate/he article info Article history: Received 10 August 2012 Received in revised form 29 October 2012 Accepted 4 November 2012 Available online 17 December 2012 Keywords: Energy Exergy Hydrogen production OTEC Water electrolysis Solar energy 1. Introduction Hydrogen as an energy carrier can facilitate sustainable energy systems. The development of sustainable carbon- neutral energy sources has become one of the most signifi- cant issues in the world today. Hydrogen can be produced from various energy sources using methods like biomass conversion, steam methane reforming and water splitting. Hydrogen can be produced in a relatively environmentally benign manner (depending on the source of the input energy) via splitting water by photocatalysis, thermochemical cycles and electrolysis. Currently, both thermochemical and photo- catalysis hydrogen production are not economically abstract Energy and exergy analyses are reported of hydrogen production via an ocean thermal energy conversion (OTEC) system coupled with a solar-enhanced proton exchange membrane (PEM) electrolyzer. This system is composed of a turbine, an evaporator, a condenser, a pump, a solar collector and a PEM electrolyzer. Electricity is generated in the turbine, which is used by the PEM electrolyzer to produce hydrogen. A simulation program using Matlab software is developed to model the PEM electrolyzer and OTEC system. The simulation model for the PEM electrolyzer used in this study is validated with experimental data from the literature. The amount of hydrogen produced, the exergy destruction of each component and the overall system, and the exergy efficiency of the system are calculated. To better understand the effect of various parameters on system performance, a para- metric analysis is carried out. The energy and exergy efficiencies of the integrated OTEC system are 3.6% and 22.7% respectively, and the exergy efficiency of the PEM electrolyzer is about 56.5% while the amount of hydrogen produced by it is 1.2 kg/h. Crown Copyright a 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. competitive. Water electrolysis is a mature technology for large scale hydrogen production. Hydrogen production by proton exchange membrane (PEM) electrolysis has numerous advantages, such as low environmental impact and easy maintenance. A large amount of solar energy is stored as heat in the surface waters of the world’s oceans, providing a source of renewable energy. Ocean thermal energy conversion (OTEC) is a process for harnessing this renewable energy in which a heat engine operates between the relatively warm ocean surface, which is exposed to the sun, and the colder (about 5 C) water deeper in the ocean, to produce electricity. OTEC usually incorporates a low-temperature Rankine cycle engine * Corresponding author. Tel.: þ1 289 600 9505. E-mail addresses: pouryaahmadi81@gmail.com, Pouria.Ahmadi@uoit.ca (P. Ahmadi), Ibrahim.Dincer@uoit.ca (I. Dincer), Marc. Rosen@uoit.ca (M.A. Rosen). 0360-3199/$ e see front matter Crown Copyright a 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. http://dx.doi.org/10.1016/j.ijhydene.2012.11.025PDF Image | H2 Energy
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